biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 50:138-141, 2006 | DOI: 10.1007/s10535-005-0089-3

Effects of drought stress on photosynthetic gas exchange, chlorophyll fluorescence and stem diameter of soybean plants

Y. Ohashi1, N. Nakayama1, H. Saneoka1,*, K. Fujita1
1 Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan

Changes in plant growth, photosynthetic gas exchange, chlorophyll fluorescence and stem diameter of soybean [Glycine max (L.) Merr.] plants under drought stress were studied. Total plant dry mass was reduced by 30 % compared to well-watered control plants. Leaf water potential was slightly decreased by water stress. Water stress induced daytime shrinkage and reduced night-time expansion of stem. Photosynthetic rate, stomatal conductance and transpiration rate were significantly declined by water stress, while the intercellular CO2 concentration was changed only slightly at the initiation of stress treatment. The maximum photochemical efficiency of photosystem 2 and apparent photosynthetic electron transport rate were not changed by water stress.

Keywords: Glycine max; growth; net photosynthetic rate; photochemical efficiency of photosystem 2; stomatal conductance; transpiration rate; water stress
Subjects: chlorophyll a,b; chlorophyll fluorescence; drought stress; gas exchange; growth analysis, plant development, biomass and yield enhancement; photochemical efficiency of PS2; photosystem 2; potentials, osmotic, water; soybean; stem diameter, water stress; stomatal conductance; transpiration rate; water stress

Received: March 10, 2004; Accepted: September 1, 2005; Published: March 1, 2006  Show citation

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Ohashi, Y., Nakayama, N., Saneoka, H., & Fujita, K. (2006). Effects of drought stress on photosynthetic gas exchange, chlorophyll fluorescence and stem diameter of soybean plants. Biologia plantarum, 50(1), 138-141. doi: 10.1007/s10535-005-0089-3
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